Machine tool



Feb, 7, l%@ 1. E. cox 9 9 7 MACHINE TOOL Filed Aug. :51, 1948 lIShets-Sheet 1 MW 1 i I Feb. 7 1950 v I. E. cox 2,495,379 MACHINE TOOL Filed Aug. 51, 1948 11 Sheets-Sheet 2 [nvekior 9000 f erz COX fiorwe yq;

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MACHINE TOOL Feb. 7 1950 11 Shee ts-Sheet 3 Filed Aug. 31, 1948 l. E. COX

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MACHINE TOOL Filed Aug. 31, 1948 11 Sheets-Sheet 5 [nvenior 130cm fg czene C X 52 %vzg,wb M LLM i-torrze nf Feb. 7, 1950 l. E. cox 2,

MACHINE TOOL Filed Aug. 3l, l948 ll Sheets-Sheet 6 'n HIIIIM ffiWeflZor fs'aaa fig g 2 M M Feb. 7, 1956 1. E. cox 294967379 MACHINE TOOL Filed Aug. 31, 1948 ll Sheets-Sheet 7 Feb 7, E95@ 1. E. COX

MACHINE TOOL Filed Aug. 31, 1948 11 Sheets-Sheet 8 11 Hum- I. E. COX

MACHINE TOOL Feb. 7 1950 1]. Sheets-Sheet 9 Filed Aug. 51, 1948 Lllllllaillll jr z'veflfor X 706 flyene CQX 5 y m o W l. E. COX

MACHINE TOOL Feb. 7, 11950 11 Sheets-Sheet 10 Filed Aug. 31, 1948 VA. a w W t e e m n m W g m n C m WW ffI/Jr/lll/ll/fl lfi7! !lrlllllrnrllllll w m m 5 mm ovwm Qt Q m.\ NJWIM. QM, QM. 4% 1 W11 Wl was F is m MW Feb. 7, 1950 l. E. cox 2,496,379

MACHINE TOOL Filed Aug. 51, 1948 ll Sheets-Sheet ll 5950 g lfl m 46L w 542 F 2f FEED KJJGHT TO BORE f FACE) REVERSE REVERSE Weiss; Loggglfguc hvefiz V ADVANCE r R E F wow TURRET @8126 J H? TRAVERSE LEFT new WORK ATSTA. CLAMPED MW M gig? INDEX Q Patented Feb. 7, 1950 MACHINE TOOL Isaac Eugene pox, Kjrkwood, Mo., assignor to American Brake Shoe Company, New York, N. Y., a corporation of Delaware Applicationi August 31, 1948, Serial No. 47,051

14 Claims.

This invention. relates to machine tools: andparticularly to machine tools for the machining of bearing surfaces of segmental bearingsfor rotative shaftsand the like.

In the productionzoti segmental bearingsfor rotativeshaftSandtthe-likmit is usually the practice to form the bearing: with an inner liner or surfacing of a: bearing. metal. such as Babbitt. metal, and in most instances this Babbitt meta1= liner is machined so as to afford a proper bearing'surfacet- It is an important object of the present invention -tosimpliiy the finishingmr ma-- chin'in'g'of' such'- bearing-surfaces. More specifi-- cally, it is an object of the present-invention to simplify" the attainment of proper alignment of the-machined bearing surfacei'with. respect to the: mounting surfaces ofisuchabearingsand an object. related to the foregoing is to simplify the processof mounting and aligninga: bearing with: respect to the-boring means thatis to effect the desired surfacing operation.

One situation where the problem oii properly forming andl'ocating' the machined'bea'ring sur-- faces in abearingis encountered is in the production of journalbearings'and'thelike for use in railway equipment. Such journal. bearings have reached a; relatively-high stateof standardization, and the present development: hasbeen undertaken-with-the' ideaof enabling true interchangeability of the bearingsto' be attained. It

will be evident ofcourse that under such cir-- cumstances it is-essential that the product be madein every instance so asto come-within the standards set bythe railway association; thereby to make it possible to=quicklymountcthe journal hearings in position in the journal boxes of the railway equipment, and it-is to enable such=accuracy in journal hearings to be attained in a simple and efiective manner that the present invention is directed. It will be recognized: of course-thatjournal bearings for useon railway equipment are relatively large-and'heavy so that itis quite dimcult to'lift and: manipulate such bearings in the course of mounting: the hearings in position? on the machine which: is'to accomplish the boring-or surfacing operation, and=itis afurther and important object of: the present invention to enable :such bearings to: be initially positioned inapproximately the desired location on the machine that is-to perform the worm-and to-thereafter impart shifting'and clampingiforces to sucha-bearing-by power means so as to thereby quickly attain: accurate location of the'bearings in: the" machine. An object related to theretogoing is; to enablesuchbearing after it hasbeen ject is to enablesuch a bearing after completion of the work thereon to be shifted to a position or location such that removal of the complete bearing may readily be accomplished.

Where segmental bearings such as railway journalbearings are to be used under heavy loads,.

it has been found to be advantageous-to initially machine the bearing. surface so that the breaking-in. process in the use of thebearing. isfacilitated andthishas been accomplished in the past by boringthe bearing longitudinally in two distinct boringoperations, the centers of whichare slightly displaced so that the intersection of the two cylindrical surfaces affords,- in effect, two longitudinal lines of potential. contact formed along the bearing and spaced on opposite sides of the transverse center of the bearing surface. It has been found in the past that'heari'ngs that are thus formed are highly advantageous when the surfaces-of the two bores are accurately related one to the other, but in those instances where the bearings lack uniformity of bearing contact with the shaft with which they areassociated, the adverse and uneven" wearing eifec't' upon such a shaft has been found t'obe highly objectionable, and as a result of this, suohspecial ly formed bearings hav'enot been'accorded'very wide acceptance. It is'theref'ore'a further object of the invention to'enable such'journal'bearin'gs' and the'like, with compound bearing surfaoesof the characte'r'd'escribed, to'be accurately 'and e'co nomica lly produced, and arrobject related t'o the foregoing is to enable the two distinctboring operations that are required insuch bearings to be performed while a bearing" isheldin a fixed position on a workholder;- thereby to assure proper alignment-and-relationship as"between the compound bearing surfaces th'atarethus formed on the bearing.

In the machining ofthe: bearing; surfaces in bearings 0f the" aforesaid character; it is possible, by reason of the good machining characteristics ofthe bearing-material; to perform the machining operations quite rapidly. Such rapid-operation, however, causes a conrespondingly: rapid: production of chips, and iii-performing such-machining operations, it therefore becomes necessany tocontinuously'dispose ofsuch chipsso that they will not interfere with-the machiningl operation In the past it has. beennecessary in machines operating on bearings of the characterhereinabdve described to stop the machine quite frequently to remove the chips therefrom, and in view of this, and in order to avoid loss of machine time, it is another important object of the present invention to enable machining operations on bearings of the aforesaid character to be performed continuously, and a more specific object is to perform such machining operations in a way that facilitates the disposal of the chips. More specifically, it is an object of the present invention to perform such machining operations in such a way that the normal supply of coolant liquid will serve to wash the chips not only away from the tool and the machine surface, but also to wash the chips completely out of the machine and into the separating screen that is normally utilized in the coolant circuit.

Other objects of the invention are to enable journal bearings and the like to be positioned and clamped in position in a machine tool in a simple and expeditious manner; to relate the work holder and clamping mechanism to the machine so as to attain an advantageous automatic cycle of operation of the clamping means and the work performing elements of the machine; and to afiord a work clamping and positioning fixture which functions not only in the Work positioning and clamping operations, but also to dispose the work out of contact with the tools during the idle movements of the elements of the machine.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accompanying drawings which, by way of illustration, show a preferred embodiment and the principles thereof and what I now consider to be the best mode in which I have contemplated applying those principles. Other embodiments of the invention embodying the same or equivalent principles ma be used and structural changes may be made as described by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

Fig. l is a left-hand end elevational view of the work fixture utilized in the machine of the present invention, the view being taken from the line l-l of Fig. 2;

Fig. 2 is a front elevational view of the fixture;

Fig. 3 is an enlarged perspective view showing one of the work clamping or retaining elements;

Fig. 4 is a vertical sectional view taken substantially along the line 4-4 of Fig. 2;

Fig. 5 is a perspective view of a portion of the work fixture;

Fig. 6 is a sectional view taken substantially along the line G6 of Fig. 2;

Fig. 7 is a view looking rearwardly and showing the forward face of the fixture as viewed from line 11 of Fig. 6;

Fig. 8 is a view looking forwardly and showing the rear face of the work supporting turret in one of its positions, and as viewed from the line 8-8 of Fig. 6;

Fig. 9 is a view taken substantially along the line 9--9 of Fig. 10;

Fig. 10 is a vertical sectional view taken through the rotative or indexing axi f h W rk S pporting turret;

Fig. 11 is a fragmentary front elevational view of the machine showing the relationship of the work fixture to the machine and to the work supply and work disposal conveyors;

Fig. 12 is a fragmentary vertical sectional view illustrating the final work positioning means;

Fig. 13 is a vertical sectional view taken from front to rear in the machine and illustrating the 5 way in which the chips are flushed away from the working position of the machine;

Fig. 14 is a plan sectional view taken substantially at the horizontal axes of the boring spindles and illustrating the relationship of the work to these spindles;

Fig. 15 is a perspective view of a standard railway journal bearing of the kind that is adapted to be finish-bored by the machine of the present invention;

Fig. 16 is a longitudinal vertical section through the bearing shown in Fig. 15;

Fig. 17 is a transverse sectional view taken substantially along the line II-l'l of Fig. 16;

Figs. 18, 19 and 20 are views similar to Fig. 17 and illustrating in a somewhat diagrammatic manner the form of the inner surface of the hearing at different stages in the manufacture thereof;

Fig. 21 is a diagrammatic view illustrating the cycle of machine operation; and

Figs. 22 to are fragmentary and somewhat diagrammatic views illustrating successive positions assumed by the work piece with respect to the spindles in the course of a cycle of machining operations.

The present invention is concerned with the machining of segmental bearings such as a standard AAR journal bearing 30 that is illustrated in detail in Figs. 15, 16 and 17 of the drawings, and as a preliminary to the description of the machine of the present invention, the structural characteristics of the bearing 30 will be described in detail.

Journal bearings such as the bearing 30 are usually cast from a material such as brass to afford a body 30B having a cylindrical internal surface 3| of the general form that is desired in the bearing surfaces of the bearing but of a somewhat larger diameter so as to accommodate an internal liner 32 which is cast in place on the internal surface 3| from a bearing material such as Babbitt metal. Since the bearing surfaces that are to be afforded by the liner 32 must be accurately located by mounting of the bearing 36 in a support such as a journal box, the body 363 of the bearing is provided with a plurality of locating surfaces which serve in such a mounting operation to properly position the bearing with respect to the mounting means such as a journal box. Thus, the body 30B has a pair of fiat upper surfaces 30l and 3ll-2 that are in many instances separated by a depressed or cutaway area 30-3. Along opposite longitudinal edges of the surfaces 38-4 and 3ll2, angular co locating or wedge surfaces 30-4 and 3B-5 are afforded, these elongated angular surfaces being accurately disposed in a parallel relation with respect to the .longitudinal axis that is to be established for the bearing surfaces of the babbitt liner 32. Downwardly and outwardly from the surfaces 30-4 and 30-5, a pair of outwardly extending lugs 30-4 and 3U1 are provided and these lugs are disposed adjacent to one end of the bearing and they afford surfaces 30-8 and 309 respectively that face in an endwise direction toward the other end of the bearing. At such other end, which is usually termed the collar or flange end of the bearing, the bearing 30 is provided with an upstanding flange 30F that affords a shoulder 3lll0 facing endwise of the bearing and toward the shoulders 30-8 and 309. The other edge of the flange 30F is provided with'a wedge surface 30W that slopes downwardly from the top of the flange 30F to the adjacent end surface 30E of the bearing. At the ends of the flange 30F, the corners are rounded, and the wedge surface 30W is also rounded as at 30W--2 in Fig. 15.

At the end of the bearing 30, adjacent to the lugs 30-45 and 33-4, the upper corner surfaces of the body 3313 are tapered to afford wedge surfaces 30W3. The several abutment surfaces and wedge surfaces that are thus afforded on and about the top of the body 3013 of the bearing serve in a well known manner to properly locate thebearing in a journal box or the like, and the bearing surface that is to be provided on the liner 32 is so related to the aforesaid locating surfaces that such bearing surface of the liner will be properly located when the bearing has been mounted in position in a journal bearing or the like.

With respect to the formation of the liner 32, it will be observed in Fig. 16 that the liner is filleted outwardly at the end thereof so as to afford arcuate or rounded endwise bearing surfaces adjacent to the ends of the body 303. In affording this construction, the ends of the internal surface 3| of the body 30B are formed with radius corners3lR and 3lR2, and in the casting of the liner 32, the inner longitudinal surface 33 of the liner 32 is cast at the ends thereof to afford rounded or filleted corners 33R and 33R2 which correspond roughly to the form that is to be impartedztotthe internal surface'of the liner 32 in themachining operation. Furthermore, the castingrof-theliner 32 is conducted in such a way that shouldersi32S areformed along the edges of theiliner as shown-in Fig. 17, and these shoulders 3.25 are parallel to and are spaced from the bottom edge-faces 30-4 l of the body 303 of the bear ing. Thefaoes 30- are accurately formed and related with respect to the angular faces 30-4 and :30-=5 and. areparallel and accurately related toxtheyaxis or-axes upon which the final bearin surface-is to: be bored. It will be observed that the linerr-32is somewhat thicker adjacent the central portionthereof, that is, when considered in a transverse cross sectional view such as Fig. 17, and afterthe. liner. 32 has been cast, the internal facing-operationsare performed to impart the desired bearing surfaces to the liner 32. Thus, as willqbe evident in Fig. 18 of the drawing, the internal surface of the liner 32 may be relatively rough in its original cast form, although in Fig. 18 thisroughness has been considerably exaggerated. The first machining operation constitutes a-boring operation wherein the axis of the boring tool'is located at 34 as indicated in Fig. 19 of the drawings, and in this boring operation a continuous arcuate surface 35 is formed longitudinally of the bearing. As will hereinafter be pointed out in detail, the filleted or rounded edges 33R .and 33R2. as shown in Fig. 16., are also formedonthe liner 32 in the course of the machinecyclaand the times at which these end facing operationsare performed will hereinafter bBi-SG'UJ'fOD-th. "The surface 35 that is thus formed in what may be called the first boring operation extendsithrongh an arcuate range 36 indicated in Fig.19,.or.in other words this surface 35 extends to-theend shoulders 328.

The liner 32 is then bored along another axis 31 that is somewhattforwardlyor to the right of the axis fl as :shown in Fig; 20, and-this boring operation is performed with a boring tool having a slightly smaller radius so that what may be termed an eccentric bearing surface 38 is formed in the inner face of the liner 32, and this bearing surface extends through a relatively narrow range 39 as indicated in Fig. 20. Thus, the bearing surface 35 that was originally formed now extends only through two ranges 35A that, as indicated in Fig. 20, are disposed on opposite sides of the bearing surface 38. Through this formation of the pair of cooperating bearing surfaces 35 and 38 in the bearing, two parallel lines of potential bearing contact are afforded at the intersections of the surfaces 35 and 38, and it is this relation which causes the breaking-in operation in respect to the bearing to be materially facilitated.

The bearings 30 with the rough cast liners 32 therein are under the present invention subjected to the required boring and surfacing operations in the double end boring machine that is fragmentally illustrated in front elevation in Fig. H of the drawings. This double end boring machine has an elongated bed 40 with an elongated work table 4!, Figs. 2 and 7, mounted for longitudinal reciprocation thereon in a conventional manner and in such a relation that in the course of such reciprocation the ends of the table 4| may move beneath conventional bridge structures 42 that are mounted on the bed 40 adjacent opposite ends thereof. In the use of the machine, the bearing 30 that is to be surfaced is mounted on the table 4! of the machine by means of an indexing work supporting and clamping fixture 45 that will hereinafter be described in detail as to structure and mode of operation, and in the course of reciprocation of the table 4|, the workpiece that is thus clamped and supported in an operative position by the fixture 45 will be brought in succession into operative engagement with boring tools 46L, Fig. 14, and 46R, Figs. 11 and 14, for the performance of the boring and facing operations that have been described hereinbefore. The boring tools 46L and 46R are mounted for rotation on spindles, as 41, that are in turn rotatably mounted in spindle bearing members 48L and 48B. The spindle bearing members 48L and 48B are supported adjustably on the bridges 42L and 42R by spacer blocks ML and 49B which support the axes of the boring tools 46L and MR in a common horizontal plane. As will be noted in Fig. 14, the axis of the boring tool 46L is displaced rearwardly from but is parallel to the axis of the tool 46R so as to conform with the spacing of the axes 34 and 3'! hereinbefore described. The spindles 41 extend outwardly beyond the remote ends of the bearings 48L and 48R, and multiple V-belt driving connections 50L and 50R are extended downwardly from the spindles to suitable drive means of a conventional character located within the bed 40.

The table t: is provided with adjustable or settalble control dog structures of a conventional type (not shown) that operate in a conventional manner to control the feed and traverse movements of the table 4| and which also control the reversing and stopping of the table, and a pair of control panels 53 are disposed on the upper forward edge of the bearing member 48R to enable manual starting, stopping and like control functions to be attained manually through electrical control means in a conventional manner.

In the course of the reciprocation of the work parallel to the axes of the spindles, the tools 46L and 46R are effective to perform their {boring operation's', and in addition the rounded end surfaces 33R and 33R2 are formed by facing tools 54L and 54B that are mounted on the spindles of the tools 45L and 46B. as shown in 14.

The work fixture 45 is mounted on the table 4| of the machine by means of a base plate 60 that is secured to the table 4| so as to extend from front to rear thereof, and this base plate 60 moves with the table M in the reciprocation thereof. On the loase plate 60, a relatively narrow cross slide BI is mounted for reciprocation in a front torear direction by means such as ways 62, Figs. 2 and '7. This cross slide 6| extends for a substantial distance in a rearward direction, as will be evident in Fig. 13 of the drawings, and the rear portion of the cross slide BI is arranged to extend beneath an upstanding column 54 that is fixed in position by means such as cap screws 65 on the mountin late 60 of the fixture. The rearwardly extending portion of the cross slide 6! passes through a clearance space 66 formed in the lower portion of the column as will be evident in Fig. 7 of the drawings. At the rear end of the plate 60, a piston and cylinder actuator 68 is mounted on the base plate 60 and has the piston rod 69 thereof extended forwardly and connected to the rear end of the cross slide 6i so that the piston'and cylinder device 68 may function to reciprocate the cross slide between a forward position, illustrated in Fig. 6, and a rear or working position that is shown in Fig. 13 of the drawings.

The forward face of the column 64 is out away as at 10 in Fig. 13 of the drawings so as to afford clearance for the cutting tools 46L and 46R, and forwardly of this clearance space 10, the work fixture 45 has a work supporting turret 15 that is adapted for indexing movement about a horizontal axis that is disposed in the horizontal plane with the axes of the two cutting tools. The turret I5 is supported upon a horizontal mounting shaft 75 which at its opposite ends is journaled for rotating movement in upstanding side frames HL and HR, Fig. 2, which are in turn mounted in fixed upstandin positions on the cross slide 6 I.

The turret 15 as herein shown is afforded by means including an elongated core 18 which surrounds the mounting shaft 16 and is adapted for rotation with the shaft 16. The turret I5 is in the present instance arranged to afford three equally spaced work stations, I, II and III, as indicated in Figs. 1, 4 and 5, and to facilitate the provision of three such work receiving stations, the core 18 is in the present instance of hexagonal form. Thus, the core 78 has alternate faces 78A and 18B about the outer surface thereof, and the faces 18A are arranged to be disposed opposite the respective work receiving stations. The faces 18B, as shown in Fig. 6, have locating grooves 19 formed longitudinally ther of t facilitate mounting and positioning of individual mounting blocks 80 thereon. Three such mountin blocks 80 are provided, and these mounting blocks extend longitudinally of the respective faces 18B and are held in position thereon by means such as cap screws 8| as shown in Fig. 5 ofthe drawings.

Each mounting block 80 serves to afford the mounting structure at one side of each of two adjacent work stations, as will be evident in Fig. 6 of the drawings, and thus each mounting block 80 is arranged to have side faces 80S disposed at a proper angle to facilitate engagement of the angle or wedge faces 30-4 and 30-5 of a bearing 30 by means carried on such faces 808. Thus,

as will be evident in Figs. '5 and 6, each face BBB has a locating bar 82L or 82F mounted thereon, and these locating bars are arranged to abut shoulders 83 at their inner edges. The locating bars are held in position by means such as cap screws 84 that extend through the locating bars and into the mounting blocks 80. y

As will be evident in Figs. 2, 5 and 6, the 10- cating bars 82L and 82F have transverse positioning teeth 85 formed thereon adjacent to opposite ends thereof, such teeth being hardened and ground to afford accurately located surfaces for engagement with the respective wedge surfaces 30-4 and 30-5 of the bearings 30. When a bearing 30 is to be mounted in position on the turret 15, this mounting operation is performed at station I of the turret, and as will be evident in Fig. 6, station I is so arranged that the surface 18A faces upwardly and forwardly, or to the right in Figs. 1 and 6. The bearing 30 is put in position with the flange end thereof disposed to the right, as viewed in Fig. 11 of the drawings, and when this is done, the wedge surface 30-4 rests on the teeth 85 of the locating bar 82F, while the Wedge surface 30-5 rests against the teeth 85 of the locating bar 02L. When the work is thus mounted at station I, the shoulder 30-! of the bearing is located to the right of a, locating block 81 that is secured by a cap screw 88 to the surface 18A adjacent the right hand end of the core 18;- and by moving the shoulder 30-l0 to the left, and into engagement with the block 81, the bearing may be accurately located in an axial sense, as will hereinafter be described.

When the turret 15 has been located by placing a bearing 30- in the turret at station I, this bearing must then be moved by rotative indexing of the turret 15 so as to locate the bearing at station II, which constitutes the workingstation, and in order that the work piece such as the bearing 30 may be retained in the turret 15 in such indexing movement, means are provided on the turret 15 for releasably holding the bearings in position on the turret during such indexing movement. The work clamping means as provided in accordance with the present invention ar arranged to operate automatically in timed relation to the shifting movements of the cross slide Bi, and such work clamping means are arranged to automatically release and unload the work when such work has been finished and moved to station III in the course of the successive indexing movements of the turret. Thus, as shown in Figs. 1 to 5 and 8 of the drawings, a plurality of clamping arms 90L and 90F are provided, such clamping arms being mounted in the mounting blocks so that one clamping arm L is provided along the leading edge of each work receiving postion on the turret while one clamping arm 90F is afforded along the trail ing or following edge of each such work receiving position. These clamping arms are mounted adjacent to the mid point of the length of each such work receiving position, and to enable this to be done, each mounting block 80 has a relatively wide central groove 9| formed therein across the top and downwardly along the two sides of the mounting block. Within each such groove 9| a pair of mounting arms 90L and 90F are mounted on a pair, of longitudinal mounting shafts92. As will be evident in Figs. 2, 3 and 4, each clamping arm, as 90F, has a relatively wide body portion 93 through which a transverse mounting or pivot opening 94 is extended, and the arm as 90F, is arranged to extend from the body 93 substantial- 1y midway between the ends of such body. On the other side of the pivotal axis afforded by the bore 94, each such body has a projecting tail portion 95, and such tail portion 95 is disposed at one side of the center line of the arm as 90F. Thus, when two such clamping arms 90]? and ML are mounted in the mounting slot 9! of a mounting block 89, the reverse positioning of the two clamping arms locates the tail portions 95 thereof in a side by side relationship, as will be evident in Figs. 2 and 4 of the drawings. The two tail portions that are thus located within a common groove 9! may be identified as 95F and 95L, and these tail portions are displaced longitudinally of the block 80 so as to enable these tail portions to be selectively actuated by means displaced longitudinally with respect to the axis of the turret 15. Thus, each mounting block 80 is arranged to contain a pair of spring plungers 91 mounted in suitable bores within the block 811', and having springs 98 housed within such plungers and seated in aligned bores 99 in the core 18 so as to urge such spring plungers in an outward direction. One such spring plunger 9'! acts on the tail 95 of each of the clamping arms so that such clamping arms are urged yieldingly toward the clamping positions wherein the curved ends of the arms engage opposite edges of the bearings, as will hereinafter be described.

The clamping arms QUL and 90F thus tend to assume their clamping positions, and means are afforded whereby certain of these arms are moved to released or unclamped positions to facilitate loading of bearings 30 at the loading station I and unloading of the finished bearings at station III. The unclamping of such clamping arms is under the present invention effected as an incident to the movement of the turret 15 in a rearward direction and into the working position of Fig. 4. Thus, means are provided for engagement with the tail portion of the clamping arm 90L at the loading station I, and with the tail portion of the arm 90F at the unloading station III. Such selective clamp-releasing means are afforded by a pair of arms l III and ill IL that are fixed in a forwardly projecting relationship on the forward face of the column 64. The upper arm MHU has an abutment lug IUZU projecting downwardly in such relation that this lug will be engaged by the tail portion of the arm 90L that is in station I, as the fixture moves rearwardly into its working position. Similarly, the lower arm liliL has an upwardly projecting lug M211 that is arranged to be disposed in the path of rearward movement of the tail portion of the clamping arm 90F that is in station III.

Thus, when the work fixture 45 is in its rear or working position, the clamping arm 90L at station I will be in its retracted position, as shown in solid outline in Fig. l, and hence the machine operator may readily place a bearing 38 on the turret at station I in the position shown in dotted outline in Fig. 4. At the time when the fixture 45 moves to its rear or working position, the clamping arm 90F that is in station III will similarly be moved to its released position that is shown in full lines in station III, Fig. 4, and this allows the finished bearing 36 at station III to move downwardly and rearwardly with the clamping arm 9% so as to thereby move out of engagement with the clamping arm 90L at this station. When this release occurs, the bearing drops onto a discharge surface I that slopes downwardly and forwardly as shown in Fig. 4,

and the weight of the-bearing 30 is in most instances sufiicient to cause this bearing to move along the surface I05 in a forward direction to such a point that it may readily be lifted off of the surface I05 by the machine operator. When the finished bearing 30 is thus discharged in a forward direction along the surface I05, it is located in an accessible position beneath a working platform tilt which is afiorded to simplify the loading of the work fixture. The platform [06 is supported by forwardly projecting bracket arms l0! that are secured to the forward edges of the standards TIL and HR, and the platform N16 is disposed in a position substantially in a horizontal plane passing through the axis of the turret 15. The workman utilizes theplatform MB as what may be termed an-intermediate support upon which the bearingmay be supported and manipulated into a relationship such that it may conveniently be lifted into position on the turret'l5 at loading station I.

The mounting of a bearing 30 in the loading station I of the turret 15 takes place, as hereinbefore described, while the fixture is inits rear or working position, and the related clamping arm L at station I remains in its released position of Fig. 4 throughout the remainder of the working cycle of the machine. When the fixture is shifted to it's forward or retracted position at the end of the machine cycle, the clamping arm 90L at station I is, of course, permitted to return to its normal clamping relation so that the hear-- ing at station I will be firmly held in its clamped position. and it will be recognized that prior to such clamping of the bearing by the clamping arm 99L it is essential that the bearing be accurately positioned in a longitudinal sense. Such accurate lon itudinal position is, of course, attained by engagement of the shoulder 30-! 0 with the lug 81,- and under the present invention, such accurate longitudinal positioning is attained automatically during the machine cycle and prior to movement of the clamping arm 98L to its effective or clamping position.

Thus, as will be evident in Figs. 11 and 12 of the drawings, a spring plunger 1 it is mounted for longitudinal movement in a mounting bar I l i, and the spring plunger is arranged to project to the left from the bar HI and to be urged in this direction by a spring H2 housed within the mounting'bar Ill. The mounting bar III is supported in a bracket H3 that is fixed on the forward face of the bearing support 48R, and a clamping device H 5 in the bracket it enables the mounting bar l I I to be adjusted longitudinally of the machine. The mounting bar HI is adjusted so'that when the fixture 45 approaches the right-hand end of its travel as viewed in 11, the flange end of the bearing 30 will engage the spring plunger 1 Hi. With this arrangement, the continued movement of the fixture 45 to the right and to the end of its stroke causes the spring plunger H0 to exert a yielding axial force in a left-hand direction on the bearing til, and this brings the shoulder 3!J--lii firmly into engagement with the block 8'5, as will be evident in Figv 12 of the drawings. Hence, when the fixture i5 is retracted at the end of the machine cycle, the bearing 313 will be accurately located on the turret i5, and the clamping arm ML that is released at this time will serve to hold the bearing in this accurately located relationship.

After the working cycle has been completed and the newly loading bearing 30 has been ac curately clamped into position at station I, it is,

of course, essential that the turret I be indexed in a counter-clockwise direction as viewed in Fig. 4 so as to shift this newly loaded bearing into station II, while at the same time shifting the completed bearing 30 into station III for unloading. Under and in accordance with the present invention, this shifting or indexing of the turret I5 is attained by utilizing the unbalanced weight afforded by the distribution of the two work pieces on the turret. Thus, it will be evident that when a work piece is located at station II and a work piece is located at station I, the distribution of weight about the axis of the turret I5 tends to rotate the turret in a counter-clockwise direction. Under the present invention this force, tending to rotate the turret I5 in an advancing direction, is manually controlled, and the turret I5 is held in any selected rotative position by means that may be released manually when indexing movement of the turret is desired. In attaining such control of the indexing movements of the turret I5, a locating plate I I5 is fixed on the left-hand end of the shaft 76 as viewed in Fig. 10. This locating plate has three equally spaced recesses I I6 formed in the periphery thereof, and gradually sloping surfaces I I! are formed to connect adjacent edges of these recesses. The lowermost recess I I6 is adapted to be engaged by a locating roller II8 that is carried on an arm H9. The arm H9 is pivoted at I20, and has a handle I2I extended downwardly and forwardly therefrom as viewed in Fig. 1 of the drawings. A spring I22 acting between the arm I2I and a spring anchor I23 normally urges the arm H9 in a clockwise direction so as to engage the roller II8 with the edge of the positioning plate II5. As the turret I5 rotates in an indexing or counter-clockwise direction, one of the recesses II6 moves into engagement with the roller II 8 and the tension on the spring I22 is of such a magnitude that this engagement of the roller I I8 with one of the recesses II6 will under normal circumstances hold the turret I5 against further indexing movement. The roller II8 thus serves to locate the turret I5 in any desired indexed position. When the working cycle has been completed, and the turret I5 has been withdrawn in a forward direction, the operator actuates the handle I2I momentarily in an upward and forward direction as viewed in Fig. 1, and this withdraws the roller H8 and allows the turret I5 to move in a counterclockwise or indexing direction. The roller I I8 is then allowed to engage the surface III so that the roller II8 will ride into the next recess II6 so as to thereby stop the turret in its next indexed position.

As pointed out hereinabove, the roller II8 will normally stop the indexing movement of the turret and will hold the turret in its newly assumed position. This effectiveness of the roller H8 is, however, dependent to some extent upon the speed attained by the turret I5 in such indexing movement, and to assure proper operation of the fixture, means are provided under the present invention for limiting the speed that may thus be attained in the indexing movement of the turret. For this purpose, a speed limiting unit I25 is associated with the right-hand end of the turret shaft I6, as will be evident in Figs. 9 and of the drawings. Such speed limiting unit I is in the present instance in the nature of a hydraulic pump of the gear type. This pump, as shown in Figs. 9 and 10, has a casing I26 affording an upper chamber I21 and a lower chamber I28. A gear I29 fixed on the shaft I6 is disposed within the upper chamber I21, and the casing I26 is properly secured to the side plate IIR by means such as cap screws I30. A machining pinion or gear I3I is disposed in the lower chamber I28, and the gears I29 and IE thus constitute a gear pump which is utilized in affording the desired speed controlling action.

The direction of rotation of the gears I29 and I 3| is indicated in Fig. 9 of the drawings, and in this relationship a discharge chamber I32 is provided on the right-hand side of th two gears while an intake chamber I33 is afforded on the other side of the two gears. The gear pump that is thus provided is arranged to operate on what may be termed a closed circuit, and a supply of oil or other hydraulic liquid is afforded in a chamber I34 near the top of the casing I26. This supply chamber I34 opens downwardly into the upper side of the upper chamber I27. The hydraulic liquid in the discharge chamber I32 is adapted to be discharged through a discharge passage I35 which terminates in a valve seat I36 adjacent to the intake chamber I33. Beyond the seat I36 and to the left in Fig. 9, the passage is enlarged and a ball check valve is afforded in this enlarged portion of the passage. Thus, a valve made in the form of a ball I3! is urged toward the seat I36 by a spring I 38 and a stop pin in the form of a cap screw I39 is disposed in the enlarged portion of the passage to afford a guide for the spring I38 and also to serve as a stop to limit opening movement of the ball valve I31. Thus, the speed of rotation of the gear I29 is limited by the effective area of the valve orifice that is afiorded when the ball valve I3? is in its open position, and by adjustment of the abutment screw I33, this speed of rotation may be efiectually adjusted. The hydraulic speed control mechanism that is thus provided serves to limit the speed that may be attained by the turret I5 in its indexing movements, and this assures effectiveness of the positioning plate H5 and the positioning roller II8. There are occasions in the use of the machine, and particularly when th first bearing 30 is loaded on the turret 15 at loading station I when the weight distribution on the turret will tend to produce reverse or clockwise motion as viewed in Fig. 4, but under such circumstances the ball valve I3! acts as a check valve so that the gear I29 and the turret I5 are held against such undesired reverse rotation.

As hereinbefore described, the bearings are mounted in the work holding positions of the turret I5 and are accurately positioned with respect to the turret by means including the 10- cating plates 82L and 82F and the abutment block 81, as shown in Fig. 4. It is, of course, necessary in addition to such accurate location of the work on the turret to assure proper location of the work with respect to the axes of the boring tools when the work piece is moved into the working station II. In accomplishing this desired accurate location, use is made of the accurately positioned faces 3llII on the bearings 30, and these faces 3Ii-II are brought into contact with positioning or locating elements disposed on the column 54. Thus the column 64 has a pair of locating bars I42U and 2L mounted on the forward face thereof above and below the cut away portion III. The locating bar I42U is mounted in an angular seat I43U as will be evident in Fig. 4, and cap screws I44 are utilized to secure the bar I42U in position. The locating bar I42L is similarly mounted in a seat mo em I431; formed in the forwardface ofthe column 64- along the lower edge of the cut outportion 10; and-cap screws [Mare also-employed in securing this locating bar in position. As will be evident in Figs. 4 and 7, these locating bars are disposed in such positions as to-lie in the path of the noses of the clamping levers 90F and 90L that hold the bearing 30 in position on theturret; and'in order to avoid contact of these parts, clearance recesses IE'SU and I45L are formed respectively in the upper and lower positioning bars I42U and I42L. The lower positioning bar I42L has two sets of positioning teeth Ill-L formed thereon and adjacent opposite ends thereof, such positioning teeth being hardened and ground to afford accurately related contact surfaces for engagement of one surface 30- of a' bearing at points adjacent to the ends'of such surface 30-'-I i. The other or upper locating bar I42U has but one set of locating teeth I41U formed thereon, these teeth being located substantially midway between the ends of the bar I42U. Thus, the uppermost surface 30- ofthe bearing will be engaged at but a single area so that the bearing-30 will be located by three areas of contact with the surfaces-30-II of the bearing disposed in a vertical plane that is parallel to the axes of the boring tools. It willberecognized, of course; that the cross slide 60' and the turret I will-be urged rearwardly at alltimes' during a machine cycle so that the surfaces-of the locating bars Mill) and I42L will accurately locate the work inthe respect above described at all times during suchcycle.

In addition to the locating-action of the eating plates H211 and I42L', it will be recognized that the bearing must be'accurately positioned so that the axis of the bearing upon which the finishedsurfaces-are to becentered is-located in ahorizontal plane passing through theaxesof the boring tools. In this respect, the engagement of the wedge surfaces 30-4 and 30-5 of the bearing with the locating bars 8213' and 83F on the turret will dispose the bearing in a predetermined relationship with respect to the core I8 and mounting blocks 80 of the turret, and under the present invention the core '38 of the turret is so mounted and related that it may be shifted slightly to assure the desired location of th bearing with respect to the aforesaid hori- In attaining this result, the core I8 is mounted for limited rocking movement with respect to the supporting shaft 76'. This arrangement is best illustrated in Fig. 10' of the drawings wherein it will" be evident that intermediate its ends the shaft I6 has' an annular bearing surface I50 of substantial width, and this annular bearing surface is of arcuateexternal cross section-so that a portion of a spherical bearing surface is afforded. The core 18- has a relatively large central bore I5I formed from the left, and this central bore opens into-an enlarged bore I52 so as to afford a shoulder I53 thatfaces tothe right in Fig. 10. A bearing ring- I54-'- is zontal plane.

inserted from the right into the enlarged bore I52'so as to abut the shoulder I53 and-be in position' to engage one sideof-the bearing surface I50, and a similar bearingring I55 is-inserted from the right after the shaft 16" has been put in'position. A spacer sleeve I56 is=then put in position against the bearing ring I55; and an end plate I51 is secured" by means such as cap screws I588 to the righthand end inthe-core 16' so as to hold the bearingassembly'together; A similar endlplate I58 secured onthe -other end of the core I8, and it should be observed that both of-the end plates I51 and I are centrally bored at a diameter somewhat larger than the shaft I6, so as to permit limited rocking movement of the core about the spherical bearing surface I50. In order that the core 18 may rotate with the shaft I6, a transverse driving pin I60 is extended through the core I8 and the shaft 76 so as to pass through the center of the bearing surface I50, but it should be observed that the pin I60 has a relatively loose fit so that the desired rocking or aligning movement of the core 18 about the center that is afforded by the hear-- ing surface I50 may take place.

With the relatively loose or adjustable mounting of the core 18 as thus afforded, the position of each bearing 30 may be accurately determined as such bearing is mdved into working position, and this is attained through the use of co-acting aligning means on the mounting blocks 80 and the column 64. Thus, as will be evident in Figs. 5, 7 and 8, such aligning means are afforded by aligning pins I65 afforded on the column 64, and guide bushings I66 that are disposed in the faces of the mounting blocks 80. Thus, the mounting blocks 80 are so formed that surfaces 80S. are provided thereon so that two such faces 805 on opposite sides of the bearing 30 at station II are parallel to the forward face of the columnwhen the fixture is moved toward the column. The surface 808 that is adjacent to the locating bar 82F will be located in what may be termed an uppermost position, and this surface has but a single guide sleeve IB6-I mounted therein as viewed in Fig. 8. The other surface 80S which is located adjacent to the bar 82L has two guide sleeves "56-2 and I663, and guide pins I65 are afforded on the column to cooperate with the guide sleeves that are thus afforded. Thus, as will be evident in Fig. 7 of the drawings, the guide pin I65-I is mounted on the column 64 just above the locating bar I42U for cooperation with the sleeve I66-I. Similarly, a guide pin I65'2 is located beneath the bar I41L in position for cooperation with the guide sleeve "56-2, while a mounting pin I6-5--3 is mounted below the bar I42L for cooperation with the guide sleeve IES--3. It will be observed that all three of the guide pins I65 have their tapered end portions of a somewhat diamond-shaped cross-sectional form, and in respect to the uide pins l'B5-I and I65-2, the long axis of the dia mond is in each instance disposed in a horizontal direction while the long axis of the diamond on the guide pin I653 is disposed in a vertical direction. The guide pins I65 are arranged to have a snug fitting relationship with respect to the related guide sleeves I66 so that as the turret moves in a rearward direction towards its working position, the several guide pins I65 will-enter the guide sleeves I66, and-if the core 18 cfzthe turret is not properly aligned, the 00- operating guide pins and guide sleeves willrock the core and the'related parts-of the turret about the axis of the bearing surface I50. Such movement will be about an axis that is substantially normal to the vertical plane defined by the effective surfaces of the locating bars I42U and I 42L so that when the surfaces 30-II ofthe bearing- 30 engage these locating. bars; the. final clamping of the bearing will accurately locate the wedge surfaces til- 5 as well. as the net faces alt-II of the bearing in the desired relationship with respect=to the axes of-theboring. tools;

It will be recognized :that there is: a possibility that the cross slide may inadvertently be started through its forward or advancing stroke at a time when there is no work piece disposed on the turret 15 in station 11, and to avoid injury to the parts of the mechanism in such circumstances, safety stop means are provided which will stop movement of the cross slide before any part of the turret comes into contact with the cutting tools. Thus, as shown in Fig. 7, a pair of abutment rods I10 are mounted respectively in the areas occupied by the locating bars I42U and NHL. These safety stop bars are arranged to be engaged by surfaces 80S-2 that are formed on the blocks 36, and the relationship is such that these surfaces 80S2 engage the stops 1 78 before any part of the turret reaches the zone in which the cutting tools operate.

In the course of the cutting operation, coolant liquid is supplied in large volume through means such as a supply pipe H2, Fig. 13, and is fed through one or more discharge passages H3 formed in column 64 so that such coolant liquid is discharged onto the cutting tools 46R and L in the cutting zone. This coolant liquid must, of course, be drained away from the Working zone, and under and in accordance with the present invention, the arrangement is such that this coolant liquid in its return flow to the conventional screen and collecting sump may act effec tually to flush the chips from the vicinity of the work and the cutting tools. Thus, as shown in Fig. 13 of the drawings, the upper face of the locating bar I421. slopes downwardly and rearwardly from the point of engagement with the work, as indicated at S in Fig. 13 of the drawing, and it will be observed that the cutting tools rotate in a clockwise direction as viewed in Fig. 13, so that the chips that are formed in the cutting operation are directed downwardly and rearwardly and onto the sloping surface S of the locating bar l45L. At its rear edge the sloping surface S merges with a further sloping surface S2 that slopes downwardly and rearwardly at a relatively steep angle, and thus the coolant liquid which is discharged into the cutting zone will flow downwardly rearwardly at a rapid rate along the surfaces S and S2 so that such flow of the coolant liquid will act to carry the chips along these surfaces and toward a conventional separating screen of the kind used in coolant supply systems. The coolant liquid will, of course, be accelerated in its movement due to the action of the cutting tool and the chips that are set in motion by the cutting action of the tool. Thus, the coolant supply, the direction of cutter movement, and the location of the work cooperate with each other and with the location of the sloping drain surfaces to produce an efficient chip disposal in the present machine.

It has been pointed out hereinbefore that when the finished work is shifted from the working station 11 into th unloading station III, the subsequent movement of the fixture into its forward or working position serves to release the finished work piece and discharge the same onto a forwardly sloping surfac I05. In most instances it is found that work when thus discharged actually slides downwardly and forwardly along the surface I05, and in the use of the present machine this characteristic is utilized by placing a roller conveyor I15 so that it extends along the forward or discharge end of the sloping surface I05. Hence, the finished bearing may, under such circumstances, slide off of the surface I05 and onto the roller conveyor I15, which slopes downwardly as shown in Fig. 11 -to the right, to a main work handling position where workmen may stack the finished bearings. This work handling position also constitutes the source of the new work that is to be loaded into the turret at station I, and to facilitate handling of the new work, a supply conveyor 116 is afforded, as shown in Fig. 11, which slopes from such work handling position to the left to a point adjacent the loading position of the machine. At the end of the conveyor l 76 a stop I165 is provided so that each new work piece comes to rest at a point where it may be easily grasped and lifted by a workman standing in front of th work supporting shelf I66. The workman may thus lift the new work piece from its position adjacent the stop HES, and may place this new work piece on the shelf I06 so that it may be readily manipulated and placed in position between the separated or relatively open clamping arms L and 9015 at this station of the turret while the turret is in its forward or working position.

As hereinbefore pointed out, the table 4| of the machine and th movements of the cross slide 6| are effected by conventional actuating and control mechanism, and the cycle is such that the table 41 normally comes to rest near the left-hand end of its stroke and with th cross slide 6! in its withdrawn position. The working cycle is illustrated in Fig. 21 of the drawings, wherein it will be apparent that when the cycle is initiated, the cross slide BI is advanced from its retracted rear position to its forward or working position, thereby to properly clamp into position the new work piece with respect to the cutting tools. The table 41 then moves at feed speed to th left so that the facing tool 54L may perform the facing operation required to afford the surface 33R Z. The table movement is then reversed. and the work is moved to the right at feed speed to accomplish the boring operations as well as the facing operation by the facing tool 54R. Upon completion of this last facing operation, the table movement is reversed, and after a short back-up movement at feed speed, the cross slide is moved outwardly and the table is caused to move to the left at rapid transverse speed toward the normal stop position. In Fig. 21 of the drawings, the various work loading, unloading and work clamping and unclamping actions are indicated in their relation to the cycle above described.

In the machining of bearings such as the bearing 30, the bearing that is clamped in station I of the turret I5 is first shifted into station II by indexing of the turret 15 when the cross slide 6| is in its forward or retracted position, and this work piece is then moved forwardly to its accurately located working position and is brought in succession into operative contact with the several cutting tools. Such movements of the work piece are brought about in th cycle of operation just described with reference to Fig. 21, and the successive relationships of the work to the cutting tools are diagrammatically illustrated in Figs. 22 to 30 of the drawings.

Thus, when a work piece 30 is first moved into station II of the turret, it occupies the relationship that is diagrammatically shown in Fig. 22 of the drawings. In other words, th new work piece is disposed directly forwardly of the quill of the tool 46L and is out of alignment with respect to the cutting element 24BL of the tool as well as the facing cutter 54L. In the advancing movement of the cross slide 6|, the work piece 30 is advanced forwardly toward the tool 461. and into the relationship shown in Fig. 23 of the drawings, and it is in this front to rear relationship that the work piece is maintained during the reciprocation of the table 4| of the machine. Thus, when the table starts its feed movement to the left, the work piece 30 is moved toward the facing tool 54L and the facing operation is performed and is completed when the work piece reaches the relationship shown in Fig. 24 of the drawings. At this point the automatic control mechanism of the boring machine causes reversal of the table 4i so that the table moves at feed speed to the right and the work moves into operative engagement with the cutting tool 246L so that the bearing surface 35 will be formed progressively along the inner surface of the liner 32 as indicated diagrammatically in Fig. 25 of the drawings. Continuation of this right hand feed movement of the table 4| moves the right hand end of the bearing 30 into operative relation with respect to the cutting element 246R of the right-hand cutting tool 46R, as indicated in Fig. 26 of the drawings. Thus, at this point in the cycle, both of the cutting elements 246L and 246R are effective upon the work piece, and the right-hand movement of the table is continued until both of the cutting elements 246L and 246R have performed their cutting operations in respect to the work piece. The work piece thus moves to the position shown in Fig. 27 and into engagement with the facing tool 56R, and this feed movement is continued from the relationship shown in Fig. 27 to that shown in Fig. 28 so as to thereby complete the facing operation with respect to the right-hand end of the bearing. The table 41 is then reversed'so that the work piece 30 will be backed off to the left to the relationship shown in Fig. 29 of the drawings, after which the cross slide 6| is moved forwardly so as to retract the work piece 30 to the relationship shown in Fig. 30 of the drawings. At this time the speed of movement of the table 4| to the left is increased to traverse speed so that the work fixture 45 is rapidly returned to the normal stop position indicated in Fig. 21 of the drawings. As hereinabove pointed out, this rapid traverse movement of the table to the left affords an interval during which the turret I is fully withdrawn from the normal working position, and during which the indexing of the turret 15 is to be accomplished. The operator therefor-e actuates the handle [2| so as to release the turret and permit the same to index one position in a counter-clockwise direction as viewed in Fig, 4. It will be recalled that a new work piece 3|! will have been mounted in station I of the turret during the right hand feed movement of the table, and when the handle I2| is operated to cause indexing movement of the turret 15, this new work piece will be moved into the working station II of the turret.

The conventional actuating and control mechanism for the table M and the cross line GI are preferably arranged so that the table will normally be stopped when it reaches the stop position indicated in Fig. 21 of the drawings, but I have found that continuity of operation of the machine may be promoted by affording a start switch I90 arranged in a conventional manner in parallel with the usual cycle-starting switch of such mechanism and arranged to be operated by the handle I21 when this handle is actuated for the purpose of causing indexing movement of the turret 15. This serves to cause continuous opera- 18 tion of the table and cross slide actuating means so long as the requisite indexing operation is properly performed in each return or left-hand stroke of the table 4|.

From the foregoing description it will be evident that the present invention enables extreme accuracy to be attained in railway journal bearings or the like in a simple and effective manner, and it will also be evident that the present invention enables the bearings which are quite heavy to be initially positioned in approximately th desired location in the work holding means of the machine and to be thereafter shifted and clamped by power means so as to attain a final accurate location of the bearing during th boring and other operations. It will also be apparent that under the present invention it is possible to rapidly produce bearings having a compound bearing surface, and it is possible to accomplish this in an extremely economical manner. Under the present invention the handling of the bearings is relatively simple, and may be performed rapidly so as to enable substantially continuous operation of the machine to be attained. Moreover, the present invention relates the work to the cutting tools and to the coolant disposal system in such a way that the large volume of chips produced in the cutting operation are effectually carried away from the working position so as to avoid interference with the cutting tools.

Thus, while I have illustrated and described the preferred embodiment of my invention, it is to be understood that this is capable of variation and modification and I therefore do not wish to be limited to the precise details set forth, but desire to avail myself of such changes and alterations as fall within the purview of the following claims.

I claim:

1. In a boring machine for machining arcuate bearing surfaces in segmental bearings and the like, a bed having a longitudinal reciprocable table mounted thereon, at least one cutting tool rotatably mounted on. said bed and over said table and parallel to the path of reciprocation of said table, means for rotating said cutting tool so that the cutting elements thereof move downwardly on the side thereof that is adjacent the forward side of said bed, a cross slide mounted on said table for horizontal reciprocation from front to rear thereof, pressure fluid operated means on said table for imparting such reciprocation to such said cross slide, an upstanding column mounted on said table adjacent the rear edge thereof for reciprocation with said table, said column having a cut out portion affording clearance for said cutting tool and said column also having a forward face having forwardly facing positioning surfaces disposed above and below such cut out portion for engagement by opposite edge surfaces of such a segmental bearing or the like, said positioning surfaces being disposed in a vertical plane, said column also having a chip disposal passage formed therein and extending rearwardly and downwardly from the upper edge of the lowermost one of said positioning surfaces, a work supporting member mounted on said cross slide adjacent the forward end thereof and having work receiving position adapted to face rearwardly to support a segmental bearing in a rearwardly facing location, and interengageable guiding and positionin means on said supporting member and said column for accurately positioning said work supporting member as-said work supporting member is moved rearwardly.

2. In a boring machine for machining arcuate 

